range-diff is awesome, but the interface is a bit silly. Add a bunch
of shortcuts, inspired by what git diff does.

v2: Add it to the developer commmands list. With this dim range-diff
is useable on any git repo, not just a dim managed one.

Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
---
 dim     | 14 ++++++++++++++
 dim.rst |  8 ++++++++
 2 files changed, 22 insertions(+)

diff --git a/dim b/dim
index 12c80e2051b6..f8079aa2dc4d 100755
--- a/dim
+++ b/dim
@@ -475,6 +475,19 @@ function dim_retip
        git rebase --onto $new_upstream $upstream $branch "$@"
 }
 
+function dim_range_diff
+{
+       local branch
+
+       branch=${1:-@\{1\}}
+
+       if [[ $branch != "" && $(git rev-parse $branch | wc -l) -eq 1 ]] ; then
+               git range-diff $branch...HEAD
+       else
+               git range-diff "$@"
+       fi
+}
+
 # update for-linux-next and for-linux-next-fixes branches
 function update_linux_next # branch next next-fixes fixes
 {
@@ -2188,6 +2201,7 @@ function list_developer_commands
                "cite"
                "fixes"
                "retip"
+               "range-diff"
                "sparse"
                "tc"
                # help commands
diff --git a/dim.rst b/dim.rst
index b149fa39445e..9e41133aeb8d 100644
--- a/dim.rst
+++ b/dim.rst
@@ -95,6 +95,14 @@ retip [*branch*] [*git-rebase option* ...]
 Rebase the given local branch, current branch by default, onto drm-tip. Options
 after the branch will be passed to **git-rebase**.
 
+range-diff [ *commit-ish* | *git-range-diff options* ]
+------------------------------------------------------
+
+Convenience wrapper around the git range-diff command which automatically
+compares against HEAD if you only specify a commit-ish. In all other cases
+forwards to git range-diff. Defaults to @{1}, which is very useful for 
reviewing
+rebases.
+
 COMMANDS FOR COMMITTERS AND MAINTAINERS
 =======================================
 
-- 
2.19.0.rc2

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